Operation tunnel safety and service life evaluation method

Abstract

The invention discloses an operation tunnel safety and service life evaluation method, and relates to the technical field of tunnel safety evaluation. The operation tunnel safety and service life evaluation method comprises the following steps: S1, collecting related data of tunnel investigation, design, construction and use processes, surveying the geological environment around the tunnel and the change of the surrounding environment, setting an investigation period to be six weeks, setting the investigation duration of each time to be 1-2 hours, and setting the investigation frequency to be four times per day, the survey interval is 4 hours, and designing standards and requirements according to survey data. According to the method, the elastic deformation of the material stress sigma is corrected aiming at the unique top arc-shaped structure of the tunnel supporting structure, so that an accurate evaluation system for the safety of the operating tunnel can be obtained. Meanwhile, various conditions are considered for evaluation of the service life of the tunnel, and evaluation of the service life of the tunnel is accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel safety assessment, and in particular relates to a method for assessing the safety and lifespan of an operating tunnel. Background Art

[0002] Tunnels are engineering structures buried in the earth, representing a form of human utilization of underground space. Tunnels can be categorized as transportation tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. During and after tunnel construction, tunnel safety and lifespan assessments are necessary.

[0003] Assessing tunnel safety and lifespan requires extensive field and real-time monitoring data. Incomplete data collection or insufficient monitoring equipment can lead to inaccurate and incomplete assessment results. However, traditional assessment standards and methods may not fully cover all potential safety risks, especially with the application of new technologies and materials, which present new challenges. Furthermore, tunnel support structures undergo elastic deformation due to pressure, making it difficult to accurately calculate the tensile strength of the support structures using traditional assessment methods, resulting in significant deviations in safety and lifespan assessments. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for evaluating the safety and life of an operating tunnel to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for evaluating the safety and life of an operating tunnel, comprising the following steps:

[0007] S1. Collect relevant data on the tunnel survey, design, construction, and operation process, and survey the geological environment surrounding the tunnel and any changes in the surrounding environment. The survey cycle is set to six weeks, with each survey lasting 1-2 hours, and the number of surveys set to four per day, with a 4-hour interval between each survey. Design standards and requirements are based on the survey data.

[0008] S2. Collect relevant construction methods and materials used in the tunnel survey, design, and construction process. Based on the materials used in the construction, derive the material stress (σ), material elastic modulus (E), material strain (ε), material safety factor (K), and concrete ultimate compressive strength (Ra).

[0009] S3. Collect data on the tunnel survey, design, construction, and use, as well as any problems encountered during use. Comprehensively consider the number and frequency of tunnel maintenance to generate assessment data that is backward compatible and determine a minimum service life.

[0010] S4. Based on actual on-site tunnel inspections, a safety assessment system for operating tunnels will be established based on the degree of tunnel deformation, water leakage, and changes in support structure strength.

[0011] S5. Comprehensively classify the safety assessment system of operating tunnels, and provide recommendations on the frequency and means of subsequent inspection and maintenance for operating tunnels at different levels based on the classification.

[0012] As a preferred solution of the present invention, for detecting the degree of tunnel deformation in S3, three-dimensional laser scanning technology is used to quickly and holographically record the three-dimensional coordinates, reflectivity, and texture information of the surface of the measured object based on the principle of laser ranging, thereby monitoring the overall convergence deformation and local deformation of the tunnel. The specific calculation formula is:

[0013] Deformation rate = (current measurement value - previous measurement value) / time interval.

[0014] As a preferred solution of the present invention, for the detection of water leakage in S3, the pipe gap calculation method is used to monitor the water leakage of the pipelines laid and constructed in the tunnel in real time. The specific calculation formula is:

[0015] q=W / (T\times L),

[0016] Where, q is the water seepage rate L / (min·m), W is the water replenishment rate L, T is the observation time min, and L is the length of the pipe section m.

[0017] As a preferred solution of the present invention, the strength of the supporting structure in S3 mainly includes the calculation of tensile strength and compressive strength.

[0018] As a preferred embodiment of the present invention, the tensile strength is calculated using the following formula:

[0019] Rl=AF,

[0020] Among them, Rl: represents the ultimate tensile strength of concrete, F: represents the tensile force, and A: represents the force-bearing area.

[0021] As a preferred solution of the present invention, the specific calculation formula for the tension F is:

[0022] F=σA,

[0023] Among them, σ: material stress, A: represents the cross-sectional area under stress;

[0024] In addition, considering the elastic deformation of material stress σ, elastic correction is performed on σ. The specific calculation formula is:

[0025] σ=Eε,

[0026] E: represents the elastic modulus of the material, ε: the material strain.

[0027] As a preferred embodiment of the present invention, the specific calculation formula for the compressive strength is:

[0028] N=K·Ra,

[0029] Among them, N represents the axial force, K represents the safety factor, and Ra represents the ultimate compressive strength of concrete.

[0030] Compared with the prior art, the present invention provides a method for evaluating the safety and lifespan of an operating tunnel. One or more of the above technical solutions have the following beneficial effects:

[0031] 1) When assessing the safety of operating tunnels, 3D laser scanning technology can continuously analyze and evaluate the stability of the surrounding rock and the safety of the support structure during tunnel construction, and dynamically optimize and adjust the support design to ensure tunnel construction safety. At the same time, the elastic deformation of the material stress σ, which is unique to the top curved structure of the tunnel support structure, is corrected to ensure the accuracy of the tensile strength calculation data of the operating tunnel, resulting in a precise assessment system for the safety of operating tunnels.

[0032] 2) When evaluating the service life of an operating tunnel, the tunnel's standardized uplift force and uplift displacement force-displacement curve parameters, as well as the uplift displacement force-displacement curve, are calculated. Combined with testing of the tunnel's material properties, environmental conditions, design standards, and construction quality, the tunnel's service life can be accurately calculated. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 is a schematic diagram of the operating tunnel safety assessment method of the present invention;

[0035] Figure 2 It is a schematic diagram of the service life assessment method of an operating tunnel according to the present invention. DETAILED DESCRIPTION

[0036] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0037] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0038] Herein, all features such as values, amounts, amounts, and concentrations defined in numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to include and specifically disclose all possible subranges and individual values ​​within the range (including integers and fractions).

[0039] In this document, unless otherwise specified, “include,” “including,” “contains,” “has” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0040] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0041] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0042] The following examples were prepared using conventional instruments and equipment in the art. Experimental methods in the following examples, where specific conditions are not specified, were generally performed under conventional conditions or according to the conditions recommended by the manufacturer. The various raw materials used in the following examples, unless otherwise specified, were conventional commercially available products, with specifications conventional in the art. In the present specification and the following examples, unless otherwise specified, "%" indicates percentage by weight, "part" indicates parts by weight, and "ratio" indicates weight ratio.

[0043] Example 1

[0044] See also Figure 1 The present invention discloses a method for evaluating the safety and life of an operating tunnel, comprising the following steps:

[0045] S1. Collect relevant data on the tunnel survey, design, construction, and operation process, and survey the geological environment surrounding the tunnel and any changes in the surrounding environment. The survey cycle is set to six weeks, with each survey lasting 1-2 hours, and the number of surveys set to four per day, with a 4-hour interval between each survey. Design standards and requirements are based on the survey data.

[0046] S2. Collect relevant construction methods and materials used in the tunnel survey, design, and construction process. Based on the materials used in the construction, derive the material stress (σ), material elastic modulus (E), material strain (ε), material safety factor (K), and concrete ultimate compressive strength (Ra).

[0047] S3. Collect data on the tunnel survey, design, construction, and use, as well as any problems encountered during use. Comprehensively consider the number and frequency of tunnel maintenance to generate assessment data that is backward compatible and determine a minimum service life.

[0048] S4. Based on actual on-site tunnel inspections, a safety assessment system for operating tunnels will be established based on the degree of tunnel deformation, water leakage, and changes in support structure strength.

[0049] S5. Comprehensively classify the safety assessment system of operating tunnels, and provide recommendations on the frequency and means of subsequent inspection and maintenance for operating tunnels at different levels based on the classification.

[0050] Furthermore, for the detection of tunnel deformation in S3, 3D laser scanning technology is used to quickly and holographically record the 3D coordinates, reflectivity, and texture of the surface of the measured object based on the principle of laser ranging, thereby monitoring the overall convergence deformation and local deformation of the tunnel. The specific calculation formula is:

[0051] Deformation rate = (current measurement value - previous measurement value) / time interval.

[0052] In the above scheme, tunnel construction involves a simultaneous excavation and support process, involving a complex process of stress release and control, deformation, and deformation control. 3D laser scanning technology enables continuous analysis and assessment of the stability of the surrounding rock and the safety of the support structure during tunnel construction, allowing for dynamic optimization and adjustment of the support design to ensure safe tunnel construction.

[0053] Furthermore, for the detection of water leakage in S3, the pipe gap calculation method is used to monitor the water leakage of the pipelines laid in the tunnel in real time. The specific calculation formula is:

[0054] q=W / (T\times L),

[0055] Where, q is the water seepage rate L / (min·m), W is the water replenishment rate L, T is the observation time min, and L is the length of the pipe section m.

[0056] In this approach, water seepage is calculated by measuring the flow rate difference between the pipeline inlet and outlet. This method directly reflects the actual leakage situation, reduces the influence of human error and environmental factors, and improves calculation accuracy. It is also applicable to all types of pipeline systems, whether closed or open, and can accurately calculate water seepage using the corresponding measurement method. It is also suitable for tunnels with different pipeline installations.

[0057] Furthermore, the strength of the support structure in S3 mainly includes the calculation of tensile strength and compressive strength.

[0058] Furthermore, the calculation formula for tensile strength is as follows:

[0059] Rl=AF,

[0060] Among them, Rl: represents the ultimate tensile strength of concrete, F: represents the tensile force, A: represents the load-bearing area;

[0061] It represents the pulling force F, and the specific calculation formula is:

[0062] F=σA,

[0063] Among them, σ: material stress, A: represents the cross-sectional area under stress;

[0064] In addition, considering the elastic deformation of material stress σ, elastic correction is performed on σ. The specific calculation formula is:

[0065] σ=Eε,

[0066] E: represents the elastic modulus of the material, ε: the material strain.

[0067] In the above scheme, the tunnel support structure mainly includes initial support and later support;

[0068] 1) Initial support: The outer lining is mainly used to withstand the "early surrounding rock pressure" and help the surrounding rock achieve "basic stability" during construction, thereby ensuring the safety of the tunnel during construction.

[0069] 2) Later support: The inner lining mainly serves as permanent support to bear long-term loads.

[0070] Furthermore, the calculation formula for compressive strength is as follows:

[0071] N=K·Ra,

[0072] Among them, N represents the axial force, K represents the safety factor, and Ra represents the ultimate compressive strength of concrete.

[0073] Example 2

[0074] See also Figure 2 , the calculation of the service life of the tunnel support structure includes the following steps:

[0075] S1. Obtaining physical parameters of the tunnel and soil: Through sampling tests on the tunnel and soil, obtain physical parameters such as tunnel diameter, tunnel depth, internal friction angle, peak friction angle, limit friction angle, soil dilatancy angle, soil weight, normalized peak uplift force ratio, and normalized peak uplift displacement when the tunnel is subjected to the normalized peak uplift force ratio;

[0076] S2. Calculating force-displacement curve parameters of the standardized lifting force and the standardized lifting displacement: Calculating force-displacement curve parameters based on the acquired physical parameters to determine the force-displacement curve;

[0077] S3. Monitoring the uplift displacement of the tunnel: By monitoring the uplift displacement of the tunnel and combining it with the force-displacement curve, the standardized uplift force acting on the tunnel can be obtained, thereby monitoring the life of the tunnel structure.

[0078] Furthermore, the material properties are tested: the material properties of the support structure directly affect its durability and service life.

[0079] Furthermore, environmental conditions are tested: groundwater level, soil type, climate conditions and other environmental factors can cause erosion and corrosion to the support structure, affecting its service life.

[0080] Furthermore, the unification of design standards: the level of design standards is directly related to the strength and stability of the support structure. High-standard design can better withstand various external loads and extend its service life.

[0081] Furthermore, control of construction quality: the quality of construction directly affects the integrity and stability of the support structure. Unqualified construction will cause structural damage and shorten its service life.

[0082] In the above scheme, the service life of the tunnel support structure can be accurately calculated and predicted, ensuring its safety and stability during use.

[0083] Without limitation, any person skilled in the art who is familiar with the technical field can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and these changes should be covered by the protection scope of the present invention.

Claims

1. A method for evaluating the safety and life of an operating tunnel, characterized in that: The following steps are involved: S1. Collect relevant data on the tunnel survey, design, construction, and operation process, and survey the geological environment surrounding the tunnel and any changes in the surrounding environment. The survey cycle is set to six weeks, with each survey lasting 1-2 hours, and the number of surveys set to four per day, with a 4-hour interval between each survey. Design standards and requirements are based on the survey data. S2. Collect relevant construction methods and materials used in the tunnel survey, design, and construction process. Based on the materials used in the construction, derive the material stress (σ), material elastic modulus (E), material strain (ε), material safety factor (K), and concrete ultimate compressive strength (Ra). S3. Collect data on the tunnel survey, design, construction, and use, as well as any problems encountered during use. Comprehensively consider the number and frequency of tunnel maintenance to generate assessment data that is backward compatible and determine a minimum service life. S4. Based on actual on-site tunnel inspections, a safety assessment system for operating tunnels will be established based on the degree of tunnel deformation, water leakage, and changes in support structure strength. S5. Comprehensively classify the safety assessment system of operating tunnels, and provide recommendations on the frequency and means of subsequent inspection and maintenance for operating tunnels at different levels based on the classification.

2. The method for evaluating the safety and lifespan of an operating tunnel according to claim 1, characterized in that: To detect the deformation degree of the tunnel in S3, 3D laser scanning technology is used to quickly and holographically record the 3D coordinates, reflectivity, and texture of the surface of the measured object based on the principle of laser ranging, thereby monitoring the overall convergence deformation and local deformation of the tunnel. The specific calculation formula is as follows: Deformation rate = (current measurement value - previous measurement value) / time interval.

3. The method for evaluating the safety and lifespan of an operating tunnel according to claim 1, wherein: To detect the degree of water leakage in S3, the pipe segment gap calculation method is used to monitor the water seepage degree of the pipelines laid and constructed in the tunnel in real time. The specific calculation formula is: q=W / (T\times L), Where, q is the water seepage rate L / (min·m), W is the water replenishment rate L, T is the observation time min, and L is the length of the pipe section m.

4. The method for evaluating the safety and lifespan of an operating tunnel according to claim 1, wherein: The strength of the support structure in S3 mainly includes the calculation of tensile strength and compressive strength.

5. The method for evaluating the safety and lifespan of an operating tunnel according to claim 4, characterized in that: The specific calculation formula for the tensile strength is: Rl=AF, Among them, Rl: represents the ultimate tensile strength of concrete, F: represents the tensile force, and A: represents the load-bearing area.

6. The method for evaluating the safety and lifespan of an operating tunnel according to claim 5, characterized in that: The tensile force F is calculated as follows: F=σA, Among them, σ: material stress, A: represents the cross-sectional area under stress; In addition, considering the elastic deformation of material stress σ, elastic correction is performed on σ. The specific calculation formula is: σ=Eε, E: represents the elastic modulus of the material, ε: the material strain.

7. The method for evaluating the safety and lifespan of an operating tunnel according to claim 1, characterized in that: The specific calculation formula for the calculation of the compressive strength is: N=K·Ra, Among them, N represents the axial force, K represents the safety factor, and Ra represents the ultimate compressive strength of concrete.

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